[Haskell-cafe] Functional version of this OO snippet

[Andrew Wagner]

Hi all,
public interface IEngine {
  void foo();
  void bar(string bah);
  ...
}
public class Program {
 public void Run(IEngine engine){
  while(true){
    string command = GetLine();
    if (command.startsWith("foo")){
      engine.foo();
    } else if (command.startsWith("bar")){
      engine.bar(command);
    ...
    else break;
}
In other words, I want to provide the same UI across multiple  
implementations of the engine that actually processes the commands.

Thanks in advance.
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